How do Biden’s first 100 days in office compare with Trump’s?

A president’s first 100 days are an arbitrary benchmark, a point of measurement journalists are fond of because it allows us to draw comparisons between the current officeholder and Franklin D. Roosevelt, the last chief executive whose first three months were truly momentous.

But in recent times, the 100-day trope has also been taken seriously by presidents — including both Donald Trump and Joe Biden.

During his 2016 presidential campaign, Trump promised that in his first 100 days he would repeal Obamacare, build a wall on the border with Mexico...